﻿////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2009 Daniel F. Hanson
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
////////////////////////////////////////////////////////////////////////////////

using System;
using System.Reflection;

namespace SilverLua.Runtime
{
   internal class HostFieldHelper
   {
      internal LuaGetterHelper GetterDelegate { get; private set; }
      internal LuaSetterHelper SetterDelegate { get; private set; }
      internal Type Type { get; private set; }
      internal object Owner { get; private set; }

      internal HostFieldHelper(MethodInfo getter, MethodInfo setter)
      {
         if (getter != null)
         {
            GetterDelegate = (LuaGetterHelper)Delegate.CreateDelegate(typeof(LuaGetterHelper), null, getter);
            Type = getter.ReturnType;
         }

         if (setter != null)
         {
            SetterDelegate = (LuaSetterHelper)Delegate.CreateDelegate(typeof(LuaSetterHelper), null, setter);
            Type setterType = setter.GetParameters()[0].ParameterType;
            if (Type == null)
            {
               Type = setterType;
            }
            else if (Type != setterType)
            {
               throw new ArgumentException("Must provide getter and setter with matching types");
            }
         }
         
         Owner = null;
      }
      
      internal HostFieldHelper(HostFieldHelper field, object owner)
      {
         GetterDelegate = field.GetterDelegate;
         SetterDelegate = field.SetterDelegate;
         Type = field.Type;
         Owner = owner;
      }
   }
}